Piston for internal-combustion engines



W. J. WOODCOCK.

PlsToNFon INTERNAL coMBusTloN ENGINES.

APPLICATION FILED SEPT.23, 19H3.

Patented Dec. 9, 1919.`

nniTnD sTnTns PATENT ori-iron.

. WILLARD JAY WOODCOCK, OF BROOKLYN, NEW YORK.

PISTON FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.`

Patented Dee. e, 191e.

Application led September 23, 1918. Serial No. 255,395.

l To all 'whom t may concern:

Be it known that I, IVILLARD J AY WoonooOK, a citizen of the United States, and a resident of Brooklyn, New York, in the county of Kings and State of New York, have invented certain new and useful Improvements in Pistons for Internal-Combustion Engines, of which the following is specification.

My invention relates to pistons for internal combustion engines of the trunk type.

The usual method of using such pistons in a two cycle engine is to use the head end for developing power and compress the scavenging air in the crank case on the downward movement.

Therefore the bearings of the engine must be inclosed and inaccessible, and this type of construction has not proved successful when applied to propelling oceangoing ships where heavy reliable power is `necessary.

The object of my invention is to construct heavy marine oil engines with bearings that are accessible and consequently more reliable.

This feature can be accomplished by attaching an oblong or oval sleeve to the piston for the connecting rod to work through and to compress the scavenging air in the lower portion of the cylinder and deliver it into an air chest on the side of the cylinder. The oblong or oval sleeve running through a lower cylinder head provided with a packin box and gland.

nother object of this invention is to avoid the introduction of the suction air to the extreme hot surfaces of the engine b efore it has been compressed.

And still another object is to obtain :these results without raising the center of gravity to a considerable degree.

The methods of obtaining these results arel illustrated in the accompanying drawings.

Figure l shows an 'elevation in section.

Fig. 2 shows a side view insect-ion.

Fig. 3 shows a plan view in section.

Reference being made to Fig. l, A represents the cylinder, B the trunk piston with the oblon or oval sleeve C attached to it, or it maye simply an extension of the piston-B. D is a gland to tighten the packing E to prevent the escape of air during compression and also to prevent smoke or gas escaping into the engine room. G is the connecting rod which transmits power from the piston B to the crank H. Suction air enters through the check valve I which is located on the side of the air chest J which is attached to the cylinder A or which may be a part of the same casting.

On the upward stroke of the piston B, air is drawn in the cylinder through the ports K and K1 Fig l, which connects the air chamber J, Fig. 2, to the cylinder A, and the spaces L and L1 which are bounded by the walls of the cylinder A, and lower cylinder head M, and the under side of the piston B at N, and the oblong sleeve C, are filled with air which does not come in contact with the extreme hot surfaces of the engine due to the previous combustion in the cylinder A, and will therefore have a greater density and lower temperature. On the downward stroke of the piston B, the air will be compressed in the air chamber J until the scavenging port O Fig. 2, is opened by the downward movement of the piston B, when it escapes into the cylinder A and carries the burnt gas out through the exhaust port R. Reference again being made to Fig. 2, the space P, or inner surface of the oblon sleeve C, and in which the connecting rod works, permits air to circulate to the head of the piston B to carryraway the heat of combustion without coming in contact with the'suction air used in the cylinder.

Reference being made to Fig. 8, the ports K and K1 are necessary because the oblong sleeve C forms two separate compartments L and L1 during the suction and compression strokes, but the compressed air passes outV through the single scavenging port Ol above the piston B.

Y It is evident that by means of this invention an oil engine may be constructed with bearings that can be seen and felt, and a spray of water could be applied as on any ordinary marine steam engine used for propelling ocean going vessels, and which will tend greatly to its reliability, especially in heavy power engines. It will also be noted that the center of gravity has `not been raised to the extent as though a crosshead had been used, in which case the suction air would necessarily come in Contact with the hottest surfaces of the engine.

Having thus described my invention, what I claim as new is:

l. In an internal combustion engine, a pisi ton having an oblong` or oval hollovs7 eXtension, passlng through an oriee conforming to its external form, which is contained n the qlinder head.

v 2. n an internal combustion engine having a piston provided With an oblong or oval hollow extension passing through an orifice conforming to its external form, contained in the cylinder head, aport on either side of the said extension Cutting the Walls of the 10 cylinder.

Signed at Brooklyn, in the county of Kings and State of New York, this 23rd day of July, A. D. 1918. A

VILLARD JAY WOODCOCK.

Witnesses: l

ALLAN J.` NoAKs, AUGUSTA A. WooDooeK. 

